Liquid injection device

Abstract

The utility model relates to a liquid injection device, which comprises a sealing mechanism, a liquid injection mechanism and a liquid injection mechanism, the electrolyte injection mechanism is used for temporarily storing the electrolyte and is communicated with an electrolyte injection port of the battery so as to inject the electrolyte into the electrolyte injection port; the liquid injection mechanism is communicated with the sealing cavity, the sealing mechanism is provided with a gas port communicated with the sealing cavity, and the gas port is configured to be communicated with the vacuum generation mechanism to extract gas in the sealing cavity, the liquid injection mechanism and the battery or communicated with the positive pressure generation mechanism to fill high-pressure gas into the sealing cavity, the liquid injection mechanism and the battery; and the vibration mechanism can be at least partially arranged in the liquid injection mechanism and is used for sending ultrasonic waves to the electrolyte in the liquid injection mechanism, the electrolyte vibrates under the action of the ultrasonic waves, and the electrolyte can drive the ultrasonic waves to be spread into the battery. When the electrolyte is injected into the battery through the electrolyte injection mechanism, ultrasonic waves can be directionally propagated into the battery and generate a cavitation effect in the electrolyte, fine bubbles are continuously separated out from gaps and cavities in the battery, and meanwhile, an electric core in a battery shell can be fluffy through ultrasonic vibration. Therefore, more gas in the battery can be pumped away during subsequent vacuumizing, the liquid level in the battery can descend faster during high pressure increasing, the battery can achieve the infiltration effect more easily, the liquid injection time is shortened, and the production efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing equipment, in particular to a liquid injection device. Background Art

[0002] Lithium-ion batteries include positive electrodes, negative electrodes, separators, and electrolytes. The electrolyte provides a medium for lithium ions between the positive and negative electrodes and is the basis for the normal operation of lithium-ion batteries. As a pre-process for infiltration and formation, sufficient electrolyte needs to be injected into the battery, otherwise the battery performance will be poor or even scrapped.

[0003] Generally, the injection process of lithium-ion batteries includes the injection process and the infiltration process. In the injection process, the electrolyte is injected into the battery, and in the infiltration process, the electrolyte injected into the battery is absorbed into the battery cell. However, due to various factors (such as electrolyte characteristics, battery cell winding / stacking process, battery shape and size, battery temperature, pole piece material and internal gap of the battery, etc.) that affect the injection effect, and as the battery capacity increases, the injection time becomes longer and longer, resulting in low production efficiency. Utility Model Content

[0004] Based on this, it is necessary to provide a liquid injection device that can reduce the liquid injection time to improve production efficiency in order to solve the problem that the lithium battery liquid injection takes a long time and leads to low production efficiency.

[0005] A liquid injection device, comprising:

[0006] A sealing mechanism having a sealed cavity for accommodating a battery;

[0007] a liquid injection mechanism for temporarily storing electrolyte, which is used to communicate with the liquid injection port of the battery so as to inject electrolyte into the battery through the liquid injection port; the liquid injection mechanism is in communication with the sealed cavity, the sealing mechanism has a gas port in communication with the sealed cavity, and the gas port is configured to communicate with a vacuum generating mechanism to extract gas from the sealed cavity, the liquid injection mechanism and the battery, or to communicate with a positive pressure generating mechanism to fill the sealed cavity, the liquid injection mechanism and the battery with high-pressure gas;

[0008] A vibration mechanism that can be at least partially disposed in the injection mechanism is used to send ultrasonic waves to the electrolyte in the injection mechanism. The electrolyte vibrates under the action of the ultrasonic waves, and the electrolyte can drive the ultrasonic waves to propagate into the battery.

[0009] With the above arrangement, when the electrolyte is injected into the battery through the injection mechanism, the ultrasonic wave can be directed to propagate into the battery and produce cavitation in the electrolyte, so that tiny bubbles are constantly precipitated from the gaps and cavities inside the battery. At the same time, the ultrasonic vibration can make the battery core in the battery shell fluffy. In this way, more gas in the battery can be extracted during the subsequent vacuuming, and the liquid level in the battery can be lowered faster when high pressure is applied, so that the battery can more easily achieve the infiltration effect, which reduces the injection time and thus improves the production efficiency.

[0010] In one embodiment, the vibration mechanism includes an ultrasonic generator, an ultrasonic transducer and an ultrasonic amplifier, the ultrasonic generator is used to convert electrical energy into an electrical signal matching the ultrasonic transducer, the ultrasonic transducer is used to convert electrical power into mechanical power output, and the ultrasonic amplifier is used to amplify the particle displacement or velocity of the mechanical vibration.

[0011] In one embodiment, the liquid injection mechanism has a liquid outlet, and the liquid outlet is used to communicate with the liquid injection port of the battery; the distance between the vibration mechanism and the plane where the liquid outlet is located is less than a preset threshold; and / or

[0012] The vibration mechanism extends in a direction perpendicular to the plane where the liquid injection port is located, and is arranged in the liquid injection mechanism through the outside.

[0013] In one of the embodiments, the liquid injection device further includes a heating mechanism, and the heating mechanism can be at least partially accommodated in the sealed cavity and in contact with the battery to continuously heat the battery.

[0014] In one embodiment, the heating mechanism includes a heating plate and a heat source. The heating plate can be accommodated in the sealed cavity and in contact with the battery. A flow channel is provided in the heating plate. The heat source can provide a heat exchange medium into the flow channel so that the heating plate heats the battery; or, the heat source can generate heat by itself to conduct heat to the heating plate so that the heating plate heats the battery.

[0015] In one embodiment, the air port includes a first air port and a second air port that are independently arranged, the first air port is configured to communicate with the vacuum generating mechanism, and the second air port is configured to communicate with the positive pressure generating mechanism.

[0016] In one embodiment, the liquid injection device includes the vacuum generating mechanism, the vacuum generating mechanism includes a vacuum pipeline and a first control valve, the vacuum pipeline is connected between the first air port and the vacuum source, and the first control valve is arranged on the vacuum pipeline to control the connection and disconnection between the vacuum source and the first air port; and / or

[0017] The liquid injection device also includes the positive pressure generating mechanism, which includes an air storage tank, a positive pressure pipeline and a second control valve. The positive pressure pipeline is connected between the air storage tank and the second air port. The air storage tank is connected to a positive pressure air source. The second control valve is arranged on the positive pressure pipeline to control the connection between the air storage tank and the second air port.

[0018] In one embodiment, the liquid injection device also includes a liquid storage tank and a metering pump, and the metering pump is arranged between the liquid storage tank and the liquid injection mechanism; the liquid storage tank is used to store electrolyte, and the metering pump is used to quantitatively transport the electrolyte in the liquid storage tank to the liquid injection mechanism.

[0019] In one embodiment, the liquid injection mechanism can be accommodated in the sealing mechanism, and the liquid injection mechanism has a communication port, and the liquid injection mechanism is connected with the sealing cavity through the communication port.

[0020] In one embodiment, the injection mechanism is located outside the sealing cavity, and the injection device further includes a connecting pipeline, which connects the injection mechanism and the sealing mechanism, and the injection mechanism is connected to the sealing cavity through the connecting pipeline.

[0021] In one embodiment, the connection position between the connecting pipeline and the injection mechanism is higher than the calibrated position of the electrolyte stored in the injection mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a liquid injection device provided in one embodiment of the present application;

[0023] Figure 2 A schematic structural diagram of a liquid injection device provided in another embodiment of the present application.

[0024] Description of reference numerals:

[0025] 100. Liquid injection device; 10. Sealing mechanism; 11. Sealing chamber; 12. First air port; 13. Second air port; 20. Liquid injection mechanism; 21. Connecting port; 30. Vibrating mechanism; 40. Connecting pipeline; 50. Heating plate; 200. Battery. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0032] See also Figure 1 , an embodiment of the present application provides a liquid injection device 100 for injecting electrolyte into a battery 200 .

[0033] The liquid injection device 100 includes a sealing mechanism 10 and a liquid injection mechanism 20. The sealing mechanism 10 has a sealed cavity 11, and the sealed cavity 11 is used to accommodate the battery 200. The liquid injection mechanism 20 is used to temporarily store electrolyte, and the liquid injection mechanism 20 is connected to the sealed cavity 11. When injecting liquid, the battery 200 is placed in the sealed cavity 11, and its liquid injection port is connected to the liquid injection mechanism 20, and the liquid injection mechanism 20 is used to inject the electrolyte into the battery 200 through the liquid injection port.

[0034] It should be noted that the shapes and sizes of the sealing mechanism 10 and the injection mechanism 20 are not limited and can be selected according to specific working conditions. For example, in some embodiments, the injection mechanism 20 is a cup-shaped structure and the sealing mechanism 10 is a rectangular hollow structure. It should also be noted that the materials used for the sealing mechanism 10 and the injection mechanism 20 are not limited and the sealing mechanism 10 and the injection mechanism 20 can be made of materials that can withstand high pressure.

[0035] The sealing mechanism 10 has an air port, which is connected to the sealing cavity 11. The air port is configured to be connected to a vacuum generating mechanism or a positive pressure generating mechanism. The vacuum generating mechanism can extract gas from the sealing cavity 11, the injection mechanism 20, and the battery 200 contained in the sealing cavity 11 and connected to the injection mechanism 20 through the air port, so that the pressure in the sealing cavity 11, the injection mechanism 20, and the battery 200 is lower than the atmospheric pressure. The positive pressure generating mechanism can fill the sealing cavity 11, the injection mechanism 20, and the battery 200 contained in the sealing cavity 11 and connected to the injection mechanism 20 with high-pressure gas through the air port, so that the pressure in the sealing cavity 11, the injection mechanism 20, and the battery 200 is higher than the atmospheric pressure. For example, the pressure values ​​reached by the sealing cavity 11, the injection mechanism 20, and the battery 200 can be: 1.0MPa, 1.2MPa, 1.5MPa...2.0MPa, etc.

[0036] It should be noted here that, whether vacuuming or filling with high-pressure gas, when the pressure is stable, the pressure inside and outside the battery is the same.

[0037] With the above arrangement, when it is necessary to inject electrolyte into the battery 200, the battery 200 is placed in the sealed cavity 11 and connected to the injection mechanism 20, the vacuum generating mechanism extracts gas from the injection mechanism 20 and the battery 200, so that the injection mechanism 20 and the battery 200 are in a vacuum state, and the electrolyte is injected into the injection mechanism 20. Under the action of the pressure difference, the electrolyte flows from the injection mechanism 20 to the battery 200 to complete the injection process of the battery 200. The positive pressure generating mechanism fills the sealed cavity 11, the injection mechanism 20 and the battery 200 with gas, so that the sealed cavity 11, the injection mechanism 20 and the battery 200 are in a positive pressure state. The vacuum generating mechanism extracts gas from the sealed cavity 11, the injection mechanism 20 and the battery 200, so that the sealed cavity 11, the injection mechanism 20 and the battery 200 are in a vacuum state. The sealed cavity 11, the injection mechanism 20 and the battery 200 are repeatedly evacuated and filled with high-pressure gas until the infiltration process of the battery 200 injection process is completed.

[0038] The liquid injection device 100 also has a vibration mechanism 30, at least part of which can be accommodated in the liquid injection mechanism 20. The vibration mechanism 30 is used to send ultrasonic waves to the electrolyte in the liquid injection mechanism 20, and the electrolyte vibrates under the action of the ultrasonic waves, and the electrolyte can drive the ultrasonic waves to propagate into the battery 200. That is, in the liquid injection process, the vibration mechanism 30 can generate ultrasonic waves to the electrolyte in the liquid injection mechanism 20, and the electrolyte vibrates under the action of the ultrasonic waves. At the same time, in the process of the electrolyte flowing from the liquid injection mechanism 20 to the battery 200, the ultrasonic waves can propagate into the battery 200 along with the electrolyte.

[0039] With the above arrangement, when the electrolyte is injected into the battery 200 through the injection mechanism 20, the ultrasonic wave can be propagated into the battery 200 in a directional manner and produce cavitation in the electrolyte, so that tiny bubbles are continuously precipitated from the gaps and cavities inside the battery 200. At the same time, the ultrasonic vibration can make the battery cells in the shell of the battery 200 fluffy. In this way, more gas in the battery 200 can be extracted during the subsequent vacuuming, and the liquid level in the battery 200 can be lowered faster when high pressure is applied, so that the battery 200 can more easily achieve the infiltration effect, which reduces the injection time and thus improves the production efficiency.

[0040] It should be noted here that ultrasonic cavitation refers to the dynamic process of growth and collapse of micro-gas core cavitation bubbles in liquids that vibrate under the action of sound waves and occur when the sound pressure reaches a certain value. That is, the tiny bubble nuclei in the liquid vibrate under the action of ultrasound. When the positive pressure reaches a certain value, the bubbles will expand rapidly and then suddenly close, generating shock waves when the bubbles close. This series of dynamic processes such as expansion, closing, and oscillation is called ultrasonic cavitation.

[0041] Further reading Figure 1 The air port includes a first air port 12 and a second air port 13 which are independent of each other. The first air port 12 is configured to be connected to a vacuum generating mechanism, and the second air port 13 is configured to be connected to a positive pressure generating mechanism. Of course, in some other embodiments, the sealing mechanism 10 may be provided with only one air port, which is controlled by a valve to selectively connect to the vacuum generating mechanism and the positive pressure generating mechanism.

[0042] In some embodiments, the liquid injection device 100 includes the above-mentioned vacuum generating mechanism, and the vacuum generating mechanism includes a vacuum pipeline and a first control valve. The vacuum pipeline is connected between the first gas port 12 and the vacuum source, and the first control valve is arranged on the vacuum pipeline to control the on-off between the vacuum source and the first gas port 12. In this way, the vacuum flow and pressure in the sealed cavity 11 can be controlled by controlling the on-off and switching speed of the first control valve. Specifically, the vacuum source is a plant vacuum source or a vacuum pump, etc.

[0043] The liquid injection device 100 also includes the above-mentioned positive pressure generating mechanism, which includes a gas storage tank, a positive pressure pipeline and a second control valve. The positive pressure pipeline is connected between the gas storage tank and the second gas port 13, and the gas storage tank is connected to the positive pressure gas source. The second control valve is arranged on the positive pressure pipeline to control the on-off between the gas storage tank and the second gas port 13. In this way, the pressurized flow and pressure in the sealed cavity 11 can be controlled by controlling the on-off and switching speed of the second control valve. Specifically, the gas storage tank is connected to the high-pressure gas source or nitrogen source of the factory.

[0044] In some embodiments, continue to refer to Figure 1The liquid injection mechanism 20 can be accommodated in the sealing mechanism 10, and the liquid injection mechanism 20 has a communication port 21, and the liquid injection mechanism 20 is connected to the sealing cavity 11 through the communication port 21. In this way, when the sealing cavity 11 is evacuated or high-pressure gas is filled into the sealing cavity 11, since the liquid injection mechanism 20 is connected to the sealing cavity 11 through the communication port 21, and the liquid injection mechanism 20 is connected to the liquid injection port of the battery 200, the liquid injection mechanism 20 and the battery 200 are also evacuated or filled with high-pressure gas.

[0045] In some other embodiments, see Figure 2 The liquid injection mechanism 20 is located outside the sealed cavity 11, and the liquid injection device 100 further includes a connecting pipe 40, which connects the liquid injection mechanism 20 and the sealing mechanism 10, and the liquid injection mechanism 20 is connected with the sealed cavity 11 through the connecting pipe 40. In this way, when the sealed cavity 11 is evacuated or high-pressure gas is filled into the sealed cavity 11, since the liquid injection mechanism 20 is connected with the sealed cavity 11 through the connecting pipe 40, and the liquid injection mechanism 20 is connected with the liquid injection port of the battery 200, the liquid injection mechanism 20 and the battery 200 are also evacuated or filled with high-pressure gas.

[0046] Further, the connection position of the connecting pipe 40 and the injection mechanism 20 is higher than the calibrated position of the electrolyte stored in the injection mechanism 20. Generally, a fixed amount of electrolyte is stored in the injection mechanism 20 so that the amount of electrolyte just meets the needs of the battery 200. The calibrated position is the position of the upper surface of the electrolyte in the injection mechanism 20 when the injection mechanism 20 just stores a fixed amount of electrolyte. Since the position where the connecting pipe 40 is connected to the injection mechanism 20 is higher than the calibrated position, when the electrolyte is injected into the injection mechanism 20, it is ensured that the electrolyte will not flow into the sealed cavity 11 through the connecting pipe 40, so that the purpose of quantitatively injecting electrolyte into the battery 200 can be achieved.

[0047] The injection device 100 also includes a liquid storage tank and a metering pump, and the metering pump is arranged between the liquid storage tank and the injection mechanism 20. The liquid storage tank is used to store electrolyte, and the metering pump is used to transfer the electrolyte in the liquid storage tank to the injection mechanism 20 to ensure the effect of quantitative injection of the battery 200.

[0048] In some embodiments, the liquid injection mechanism 20 has a liquid outlet, and the liquid outlet is sealed and connected to the liquid injection port of the battery 200. Specifically, the liquid outlet of the liquid injection mechanism 20 is sealed with the liquid injection port of the battery 200 by a sealing rubber member. The distance between the vibration mechanism 30 and the plane where the liquid outlet is located is less than a preset threshold value to ensure that the ultrasonic wave emitted by it can follow the electrolyte to propagate into the battery 200.

[0049] It should be noted that the preset threshold is as small as possible, and is set as a standard not to interfere with the normal flow of electrolyte into the battery 200.

[0050] Preferably, the vibration mechanism 30 extends in a direction perpendicular to the plane where the injection port is located, and is arranged in the injection mechanism 20 through the outside. In this way, the ultrasonic waves emitted by the vibration mechanism 30 can act more on the electrolyte, ensuring the injection effect.

[0051] The vibration mechanism 30 includes an ultrasonic generator, an ultrasonic transducer, and an ultrasonic amplifier. The ultrasonic generator is used to convert electrical energy into an electrical signal that matches the ultrasonic transducer. The ultrasonic transducer is used to convert electrical power into mechanical power output. The ultrasonic amplifier (also called an ultrasonic gearshift lever or ultrasonic energy concentrator) is used to amplify the particle displacement or speed of mechanical vibration and concentrate ultrasonic energy on a small area to collect energy. In this way, the vibration mechanism 30 can input ultrasonic waves with a large amplitude.

[0052] Specifically, the ultrasonic generator is an ultrasonic / ultra-frequency generator, and the ultrasonic transducer is an ultrasonic / ultra-frequency vibration head.

[0053] In some embodiments, the liquid injection device 100 further includes a heating mechanism, at least part of which can be accommodated in the sealed cavity 11 and in contact with the battery 200 to continuously heat the battery 200. The heating mechanism heats the battery 200, which can increase the temperature of the electrolyte entering the battery 200, and the molecular movement in the electrolyte is more intense, the electrolyte fluidity is better, and the viscosity is reduced. More gas can be extracted when vacuuming, and the liquid level in the battery 200 drops faster when high pressure is applied, which further accelerates the infiltration effect, reduces the injection time, and improves production efficiency.

[0054] Further, the heating mechanism includes a heating plate 50 and a heat source. The heating plate 50 can be accommodated in the sealed cavity 11 and contact the battery 200. The heat source can make the heating plate 50 generate heat and heat the battery 200. In some specific embodiments, a flow channel is provided in the heating plate 50, and the heat source can provide a heat exchange medium into the flow channel. The heat exchange medium flows in the flow channel to exchange heat with the heating plate 50, and the temperature of the heating plate 50 increases to heat the battery 200. Specifically, the heat exchange medium can be water, heating oil or gas (air), etc., and accordingly, the heat source is a water temperature machine, an oil temperature machine or a gas heating machine. In other specific embodiments, the heat source can generate heat by itself and conduct heat to the heating plate 50, so that the temperature of the heating plate 50 increases and heats the battery. Specifically, the heat source is an electric heating plate or an electric heating wire, etc.

[0055] In some embodiments, the heating mechanism is further provided with a temperature control component, which can control the temperature of the heating plate 50. The temperature control component can be a thermocouple, a temperature control switch or a control circuit.

[0056] It should be noted that when the heating plate 50 is placed in the sealed cavity 11 and contacts the battery 200, the heating plate 50 contacts the battery 200. The contact surface of the battery 200 is not limited to the bottom surface or the side surface of the battery 200. In some other embodiments, it can also be the top surface of the battery 200.

[0057] When the liquid injection device 100 provided in the present application is used for liquid injection, the following liquid injection steps may be used:

[0058] The battery 200 is placed in the sealing cavity 11 of the sealing mechanism 10 so that the battery 200 is in surface contact with the heating plate 50 . The heating plate 50 continues to heat the battery 200 until the battery 200 is taken out after the liquid injection is completed.

[0059] The liquid outlet of the liquid injection mechanism 20 is sealed and connected with the liquid injection port of the battery 200;

[0060] The vacuum generating mechanism evacuates the sealing chamber 11, the liquid injection mechanism 20 and the battery 200;

[0061] The battery 200 is kept in a vacuum state, and the metering pump quantitatively delivers the electrolyte in the liquid storage tank to the liquid injection mechanism 20 for storage;

[0062] Under the action of the pressure difference, the electrolyte in the injection mechanism 20 is injected into the battery 200. During this process, the vibration mechanism 30 emits ultrasonic waves. The electrolyte vibrates under the action of the ultrasonic waves and can drive the ultrasonic waves to propagate directionally into the battery 200.

[0063] The positive pressure generating mechanism fills the sealed cavity 11, the liquid injection mechanism 20 and the battery 200 with gas, so that the sealed cavity 11, the liquid injection mechanism 20 and the battery 200 are in a positive pressure state. The vacuum generating mechanism extracts gas from the sealed cavity 11, the liquid injection mechanism 20 and the battery 200, so that the sealed cavity 11, the liquid injection mechanism 20 and the battery 200 are in a vacuum state. The sealed cavity 11, the liquid injection mechanism 20 and the battery 200 are repeatedly evacuated and filled with high-pressure gas until the battery 200 is fully injected.

[0064] The liquid injection device 100 provided in the embodiment of the present application has the following beneficial effects:

[0065] 1. The ultrasonic wave emitted by the vibration mechanism 30 can assist the battery 200 in injecting liquid. That is, in the process of injecting electrolyte into the battery 200 in the injection mechanism 20, the ultrasonic wave can send high-frequency vibration to the electrolyte, and propagate directionally to the inside of the battery 200 through the electrolyte through the injection port (the ultrasonic wave propagates with the electrolyte as the propagation medium), and produces cavitation in the electrolyte. Tiny bubbles are constantly precipitated from the gaps and cavities inside the battery 200. At the same time, the ultrasonic wave makes the battery 200 inside the battery 200 shell fluffy, promotes the absorption of the electrolyte inside the battery 200, and the electrolyte is easier to achieve the infiltration effect. More gas can be extracted during the subsequent vacuum pumping, and the liquid level in the battery 200 drops faster when high pressure is applied. Ultrasonic waves can speed up the injection process, reduce the injection time, and improve production efficiency.

[0066] 2. During the entire process of filling the battery 200, the heating mechanism continuously heats the battery 200, which increases the temperature of the electrolyte inside the battery 200, makes the movement of the molecules in the electrolyte more intense, improves the fluidity of the electrolyte, and reduces the viscosity. More gas can be extracted when vacuuming, and the liquid level in the battery 200 drops faster when high pressure is applied, further accelerating the wetting effect, reducing the filling time, and improving production efficiency.

[0067] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A liquid injection device, characterized in that: include: A sealing mechanism (10) having a sealed cavity (11) for accommodating a battery (200); a liquid injection mechanism (20) for temporarily storing electrolyte, and is used to communicate with the liquid injection port of the battery (200) so as to inject electrolyte into the battery (200) through the liquid injection port; the liquid injection mechanism (20) is in communication with the sealed cavity (11); the sealing mechanism (10) has a gas port in communication with the sealed cavity (11); the gas port is configured to communicate with a vacuum generating mechanism to extract gas from the sealed cavity (11), the liquid injection mechanism (20) and the battery (200), or to communicate with a positive pressure generating mechanism to fill the sealed cavity (11), the liquid injection mechanism (20) and the battery (200) with high-pressure gas; A vibration mechanism (30) that can be at least partially disposed in the injection mechanism (20) is used to send ultrasonic waves to the electrolyte in the injection mechanism (20); the electrolyte vibrates under the action of the ultrasonic waves, and the electrolyte can drive the ultrasonic waves to propagate into the interior of the battery (200).

2. The liquid injection device according to claim 1, characterized in that: The vibration mechanism (30) comprises an ultrasonic generator, an ultrasonic transducer and an ultrasonic amplifier, wherein the ultrasonic generator is used to convert electrical energy into an electrical signal matching the ultrasonic transducer, the ultrasonic transducer is used to convert electrical power into mechanical power output, and the ultrasonic amplifier is used to amplify the particle displacement or velocity of the mechanical vibration.

3. The liquid injection device according to claim 1, characterized in that: The liquid injection mechanism (20) has a liquid outlet, the liquid outlet being used to communicate with the liquid injection port of the battery (200); the distance between the vibration mechanism (30) and the plane where the liquid outlet is located is less than a preset threshold; and / or The vibration mechanism (30) extends in a direction perpendicular to the plane where the liquid injection port is located, and is inserted into the liquid injection mechanism (20) through the outside.

4. The liquid injection device according to claim 1, characterized in that: The liquid injection device further comprises a heating mechanism, which can be at least partially accommodated in the sealed cavity (11) and in contact with the battery (200) so as to continuously heat the battery (200).

5. The liquid injection device according to claim 4, characterized in that: The heating mechanism comprises a heating plate (50) and a heat source. The heating plate (50) can be accommodated in the sealed cavity (11) and in contact with the battery (200). A flow channel is provided in the heating plate (50). The heat source can provide a heat exchange medium into the flow channel so that the heating plate (50) heats the battery (200); or the heat source can generate heat by itself to conduct heat to the heating plate (50) so that the heating plate (50) heats the battery (200).

6. The liquid injection device according to claim 1, characterized in that: The air port comprises a first air port (12) and a second air port (13) which are independently arranged. The first air port (12) is configured to communicate with the vacuum generating mechanism, and the second air port (13) is configured to communicate with the positive pressure generating mechanism.

7. The liquid injection device according to claim 6, characterized in that: The liquid injection device comprises the vacuum generating mechanism, the vacuum generating mechanism comprises a vacuum pipeline and a first control valve, the vacuum pipeline is connected between the first gas port (12) and the vacuum source, the first control valve is arranged on the vacuum pipeline and is used to control the connection and disconnection between the vacuum source and the first gas port (12); and / or The liquid injection device also includes the positive pressure generating mechanism, which includes an air storage tank, a positive pressure pipeline and a second control valve. The positive pressure pipeline is connected between the air storage tank and the second air port (13). The air storage tank is connected to a positive pressure air source. The second control valve is arranged on the positive pressure pipeline and is used to control the connection and disconnection between the air storage tank and the second air port (13).

8. The liquid injection device according to claim 1, characterized in that: The liquid injection device further comprises a liquid storage tank and a metering pump, wherein the metering pump is arranged between the liquid storage tank and the liquid injection mechanism (20); the liquid storage tank is used to store electrolyte, and the metering pump is used to quantitatively transport the electrolyte in the liquid storage tank to the liquid injection mechanism (20).

9. The liquid injection device according to any one of claims 1 to 8, characterized in that: The liquid injection mechanism (20) can be accommodated in the sealing mechanism (10), and the liquid injection mechanism (20) has a communication port (21). The liquid injection mechanism (20) is connected to the sealing chamber (11) through the communication port (21).

10. The liquid injection device according to any one of claims 1 to 8, characterized in that: The liquid injection mechanism (20) is located outside the sealed cavity (11), and the liquid injection device further comprises a connecting pipeline (40), wherein the connecting pipeline (40) connects the liquid injection mechanism (20) and the sealing mechanism (10), and the liquid injection mechanism (20) is connected to the sealed cavity (11) via the connecting pipeline (40).

11. The liquid injection device according to claim 10, characterized in that: The communication position between the communication pipeline (40) and the liquid injection mechanism (20) is higher than the calibrated position of the electrolyte stored in the liquid injection mechanism (20).

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